Head for the open ocean (3,4)
I believe the answer is:
set sail
(Other definitions for set sail that I've seen before include "Embark on a voyage by ship" , "Left port" , "Leave for (sea) voyage" , "Leave port (by ship)" , "Begin a voyage" .)
I believe the answer is:
set sail
(Other definitions for set sail that I've seen before include "Embark on a voyage by ship" , "Left port" , "Leave for (sea) voyage" , "Leave port (by ship)" , "Begin a voyage" .)